ComparingÂ
 Â
NowÂ
 Â
          Â
          Â
Evaluate  as the limit of a sum.
ComparingÂ
       Â
Now  Â
                                               where n h = b - a
    Â
             Â
            Â
Put a = 1, Â b = 2
Comparing  we get
     f(x) = 2x +3 ,  a = 1,  b = 3
  Â
     f(a+2h) = f(1+2h) = 2(1+2h)+3 = 5+4h
     ...   ...    ...     ...     ...      ...
    Â
Now,Â
                 Â
Comparing  withÂ
             Â
          Â
       Â
       .............................
    Â
Now    Â
where   Â
     Â
    Â
                                     Â
Evaluate   as the limit of a sum.
ComparingÂ
     Â
Now,Â
where n h = b - a = 3 - 1 = 2
   Â
                                  Â
   Â
   Â